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Sector G: Metal Mining (Ore Mining and Dressing) Facilities U.S

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Sector G: Metal Mining (Ore Mining and Dressing) Facilities U.S Industrial Stormwater Fact Sheet Series Sector G: Metal Mining (Ore Mining and Dressing) Facilities U.S. EPA Office of Water EPA-833-F-06-022 February 2021 What is the NPDES stormwater permitting program for industrial activity? Activities, such as material handling and storage, equipment maintenance and cleaning, industrial processing or other operations that occur at industrial facilities are often exposed to stormwater. The runoff from these areas may discharge pollutants directly into nearby waterbodies or indirectly via storm sewer systems, thereby degrading water quality. In 1990, the U.S. Environmental Protection Agency (EPA) developed permitting regulations under the National Pollutant Discharge Elimination System (NPDES) to control stormwater discharges associated with eleven categories of industrial activity. As a result, NPDES permitting authorities, which may be either EPA or a state environmental agency, issue stormwater permits to control runoff from these industrial facilities. What types of industrial facilities are required to obtain permit coverage? This fact sheet discusses stormwater discharges from metal mining (ore mining and dressing) facilities as defined by Standard Industrial Classification (SIC) Major Group 10. Metal mining is defined here as all ore mining and/or dressing and beneficiating operations performed at mills operated in conjunction with the mines served or at mills (i.e., custom mills) operated separately. Facilities and products in this group fall under the following categories, all of which require coverage under an industrial stormwater permit if discharges of stormwater have come into contact with any overburden, raw material, intermediate products, finished product, byproduct or waste products located on the site of such operations: ◆ Iron Ores (SIC 1011) ◆ Copper Ores (SIC 1021) ◆ Lead and Zinc Ores (SIC 1031) ◆ Gold Ores (SIC 1041) ◆ Silver Ores (SIC 1044) ◆ Ferroalloy Ores, Except Vanadium (SIC 1061) ◆ Uranium-Radium-Vanadium Ores (SIC 1094) ◆ Miscellaneous Metal Ores, Not Elsewhere Classified (SIC 1099) Permit coverage is required of all phases of mining operations, whether active or inactive, as long as there is exposure to significant materials. This includes land disturbance activities such as the expansion of current extraction sites, active and inactive mining stages, and reclamation activities at those establishments primarily engaged in mining, developing mines, or exploring for metallic minerals (ores). 1 Industrial Stormwater Fact Sheet Series Sector G: Metal Mining (Ore Mining and Dressing) Facilities A stormwater permit generally is not appropriate for the following types of mines: ◆ Sites or parts of sites which are determined to cause or contribute to water quality standards violations ◆ Active facilities and those under reclamation, which have discharges subject to effluent limitation guidelines under NPDES, including other non-stormwater discharges such as from floor drains in maintenance buildings and preparation plant areas ◆ Pollutant seeps or underground drainage from inactive mines and refuse disposal areas that do not result from precipitation events. For these types of sites, contact the EPA or state NPDES permitting authority to determine if and what type of discharge permit may be necessary. What does an industrial stormwater permit require? Common requirements for coverage under an industrial stormwater permit include development of a written stormwater pollution prevention plan (SWPPP), implementation of control measures, and submittal of a request for permit coverage, usually referred to as the Notice of Intent or NOI. The SWPPP is a written assessment of potential sources of pollutants in stormwater runoff and control measures that will be implemented at your facility to minimize the discharge of these pollutants in runoff from the site. These control measures include site-specific best management practices (BMPs), maintenance plans, inspections, employee training, and reporting. The procedures detailed in the SWPPP must be implemented by the facility and updated as necessary, with a copy of the SWPPP kept on-site. The industrial stormwater permit also requires collection of visual, analytical, and/or compliance monitoring data to determine the effectiveness of implemented BMPs. For more information on EPA’s industrial stormwater permit and links to State stormwater permits, go to www.epa.gov/npdes/stormwater and click on “Industrial Activity.” What pollutants are associated with my facility’s activities? Pollutants conveyed in stormwater discharges from metal mining (ore mining and dressing) facilities will vary. There are a number of factors that influence to what extent industrial activities and significant materials can affect water quality. ◆ Geographic location ◆ Topography ◆ Hydrogeology ◆ Extent of impervious surfaces (e.g., concrete or asphalt) ◆ Type of ground cover (e.g., vegetation, crushed stone, or dirt) ◆ Outdoor activities (e.g., material storage, loading/unloading, vehicle maintenance) ◆ Size of the operation ◆ Type, duration, and intensity of precipitation events Because of the land-disturbing nature of the ore mining and dressing industry, contaminants of concern generated by industrial activities include total suspended solids (TSS), total dissolved solids (TDS), turbidity, acid drainage, and heavy metals. Although there are many activities that occur at a facility, this fact sheet only covers those activities that occur outdoors and where activities or materials may be exposed to precipitation. The activities, pollutant sources, and pollutants detailed in Table 1 are commonly found at metal mining (ore mining and dressing) facilities. EPA-833-F-06-022 2 Industrial Stormwater Fact Sheet Series Sector G: Metal Mining (Ore Mining and Dressing) Facilities Table 1. Common Activities, Pollutant Sources, and Pollutants at Metal Mining (Ore Mining and Dressing) Facilities Activity Pollutant Source Pollutant Site preparation Road construction Dust, TSS, TDS, turbidity Removal of overburden Removal of waste rock to expose the metal Mineral extraction Blasting activities Dust, TSS, nitrate/nitrite Beneficiation activities Milling Dust, TSS, TDS, pH, turbidity, fines, heavy metals Flotation Dust, TSS, TDS, pH, turbidity, fines, chemical reagents, acids, heavy metals Gravity concentration TSS, TDS, pH, turbidity, heavy metals Amalgamation Dust, TSS, TDS, pH, turbidity, heavy metals, mercury Waste rock storage Dust, TSS, TDS, pH, turbidity, heavy metals Raw material loading Dust, TSS, TDS, turbidity, heavy metals Process materials unloading Diesel fuel, oil, gasoline, chemical reagents Raw waste material transportation Dust, TSS, TDS, turbidity, heavy metals Leaching Heap leach piles Dust, TSS, TDS, pH, turbidity, heavy metals, cyanide Other activities Sedimentation pond upsets TSS, TDS, turbidity, pH, heavy metals Sedimentation pond sludge removal and Dust, TSS, TDS, turbidity, pH, heavy metals disposal Air emission control device cleaning Dust, TSS, TDS, turbidity, metals Equipment/vehicle fueling Fueling activities Gas/diesel fuel, oil and maintenance Parts cleaning Solvents, oil, heavy metals, acid/alkaline wastes Waste disposal of oily rags, oil and gas Oil, heavy metals, solvents, acids filters, batteries, coolants, and degreasers Fluid replacement including hydraulic Oil and grease, arsenic, lead, cadmium, fluid, oil, transmission fluid, radiator chromium, chemical oxygen demand (COD), fluids, and grease and benzene Reclamation activities Site preparation for stabilization Dust, TSS, TDS, turbidity, heavy metals Note: Activities may have additional pollutant sources that contain PFAS and can come into contact with stormwater discharges. Per and polyfluoroalkyl substances (PFAS) are a group of man-made chemicals that include PFOA, PFOS, GenX, and many other chemicals. What BMPs can be used to minimize contact between stormwater and potential pollutants at my facility? A variety of BMP options may be applicable to eliminate or minimize the presence of pollutants in stormwater discharges from metal mining facilities. You will likely need to implement a combination or suite of BMPs to address stormwater runoff at your facility. Your first consideration should be for pollution prevention BMPs, which are designed to prevent or minimize pollutants from entering stormwater runoff and/or reduce the volume of stormwater requiring management. Prevention BMPs can include regular cleanup, collection and containment of debris in storage areas, and other housekeeping practices, spill control, and employee training. It may also be necessary to implement treatment BMPs, which are engineered structures intended to treat stormwater runoff and/or mitigate the effects of increased stormwater runoff peak rate, volume, and velocity. Treatment BMPs are generally more expensive to install and maintain and include oil-water separators, wet ponds, and proprietary filter devices. EPA-833-F-06-022 3 Industrial Stormwater Fact Sheet Series Sector G: Metal Mining (Ore Mining and Dressing) Facilities Sediment ponds, discharge diversion techniques, as well as methods of runoff dispersion, are control strategies often used to minimize impacts of significant materials on stormwater. For mine sites requiring additional sources of water for processing operations, rainfall events as well as stormwater run-on will be managed for use in dust suppression, processing, and washing activities. Many mine sites are already equipped with sedimentation ponds and other established
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